Per Steve Cramer:
Bob, if your hand is coming back far enough to whack that aft clip, you
stroke is too long. Your hand really shouldn't go past your hip, and it
should be lifting the paddle up out of the water as it does. Have a look
at this guy.
http://www.atlantickayaktours.com/Pa...ion/Exit.shtml

http://www.wildernesssystems.com/pro...ngo_140_angler

I think it's blade vs hand.

In the OP, it has the blade exiting at the hips.

In the two clips above (and my own stroke...) the blade exits
astern of the hips, and it's the hand that stops at the hips.
--
PeteCresswell